apply-template

For use in macros. argv is an argument list, as in defn. expr is
a quoted expression using the symbols in argv. values is a sequence
of values to be used for the arguments.
apply-template will recursively replace argument symbols in expr
with their corresponding values, returning a modified expr.
Example: (apply-template '[x] '(+ x x) '[2])
;=> (+ 2 2)